The splendour of truth shines forth in all the works of the Creator and, in a special way, in man, created in the image and likeness of God (cf. Gen 1:26). Truth enlightens man’s intelligence and shapes his freedom, leading him to know and love the Lord. Hence the Psalmist prays: “Let the light of your face shine on us, O Lord” (Ps 4:6).
Called to salvation through faith in Jesus Christ, “the true light that enlightens everyone” (Jn 1:9), people become “light in the Lord” and “children of light” (Eph 5:8), and are made holy by “obedience to the truth” (1 Pet 1:22).
This obedience is not always easy. As a result of that mysterious original sin, committed at the prompting of Satan, the one who is “a liar and the father of lies” (Jn 8:44), man is constantly tempted to turn his gaze away from the living and true God in order to direct it towards idols (cf. 1 Thes 1:9), exchanging “the truth about God for a lie” (Rom 1:25). Man’s capacity to know the truth is also darkened, and his will to submit to it is weakened. Thus, giving himself over to relativism and scepticism (cf. Jn 18:38), he goes off in search of an illusory freedom apart from truth itself.
But no darkness of error or of sin can totally take away from man the light of God the Creator. In the depths of his heart there always remains a yearning for absolute truth and a thirst to attain full knowledge of it. This is eloquently proved by man’s tireless search for knowledge in all fields. It is proved even more by his search for the meaning of life. The development of science and technology, this splendid testimony of the human capacity for understanding and for perseverance, does not free humanity from the obligation to ask the ultimate religious questions. Rather, it spurs us on to face the most painful and decisive of struggles, those of the heart and of the moral conscience.
No one can escape from the fundamental questions: What must I do? How do I distinguish good from evil? The answer is only possible thanks to the splendour of the truth which shines forth deep within the human spirit, as the Psalmist bears witness: “There are many who say: ‘O that we might see some good! Let the light of your face shine on us, O Lord’ ” (Ps 4:6).